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{Por"t of:Stockton <br /> tj notal )May 2012 <br /> Remediation 5eimrria '' <br /> I :Free Product 9 No free product was documented throughout the life of this case' <br /> • - <br /> Soil Excavatiari An estimated,18.0 cubic yards'-of_impa6t6a soil was removed and <br /> disposed offsite in February1988 <br /> in Situ Soil Remediation::!None noted in Geotracker ` "' <br /> Ground :� - : . � <br /> • water Remediation,: In-situ chemical oxidation, ozone-injection pilot test <br /> conducted in February.2010, determined to.be ineffective;. �r <br /> Genera! Site,Coriditiions <br /> • . Geology and_Hydrogeology ";The Site'Jsunderlain by Interbedded and intermixed sand <br /> silt and clay. The depth to.first groundwater is approximately 10.feet bgs'and-the . <br /> groundwater gradient is looally mounded flowing pre�dorninantly north and s_uihIror'ri the <br /> former UST basin. The,closest surface water is the San .oaquir 'River-. ocated less plain <br /> ni ti I;000 feet north of the Sit&PWR t ..fi <br /> • E'stimate of HydrocarbonMass InSoil �WGR;t`Incestimates that approximately"' <br /> 489 pounds of�TPHg",are'sorbed-to site.-solis`� <br /> r ,.. ,� a{r.i, <br /> + Groundwater Trends: There are more than 12.years of`groundwater monitorlrigdata,for <br /> this Site. Benzenelirends are shown below, source;area (MW3-3) and down gradient <br /> {north, MW3-8} and down gradient (south, MW3 7) lf } #� f N <br /> ` ! BENZENE Results for MW3'3 <br /> aoo <br /> 4 Ae ,�" - 1E T <br /> 700'{-- — _ ...z:� t - Si- <br /> r ; Goo <br /> I f <br /> Vsrl �' S! 3 aoo r - x.. ,-6" .—� F r <br /> y,0 <br /> "0' <br /> zoo <br /> ., 3 1414,j? t �t �yyLQy 'Ie° . 'O 9 <br /> rij :,,bMM! jS1 #,��. BENZENE _...Trend - �II ! <br /> t Irv- 0�44 <br /> BENZENE Results for MW3-8 7 <br /> I I. <br /> c <br /> WOO AH <br /> wool nee. <br /> 300a <br /> —� 00 ���`t <br /> 200a r- ;I: --�,I 'Y ,( ..5���i Iwk+ <br /> R 6y� <br /> 1000. tz� <br /> Jl. $m 5Wlta: .3' I rt }1`f►7� ' <br /> BENZENE - <br /> i <br /> IIF <br />